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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 573 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.365 + 99 =
  2. 2.499 + 99 =
  3. 3.75 + 29 =
  4. 4.149 + 99 =
  5. 5.84 + 99 =
  6. 6.316 + 27 =
  7. 7.479 + 97 =
  8. 8.482 + 79 =
  9. 9.298 + 67 =
  10. 10.410 + 78 =
  11. 11.406 + 39 =
  12. 12.94 + 27 =
  13. 13.95 + 87 =
  14. 14.97 + 79 =
  15. 15.86 + 47 =
  16. 16.466 + 79 =
  17. 17.25 + 78 =
  18. 18.362 + 29 =
  19. 19.351 + 19 =
  20. 20.483 + 17 =
  21. 21.38 + 98 =
  22. 22.470 + 87 =
  23. 23.272 + 37 =
  24. 24.131 + 29 =
  25. 25.72 + 57 =
  26. 26.365 + 79 =
  27. 27.354 + 69 =
  28. 28.311 + 29 =
  29. 29.393 + 59 =
  30. 30.58 + 97 =
  31. 31.78 + 57 =
  32. 32.44 + 78 =
  33. 33.275 + 67 =
  34. 34.459 + 67 =
  35. 35.52 + 57 =
  36. 36.337 + 88 =
  37. 37.62 + 39 =
  38. 38.338 + 57 =
  39. 39.279 + 99 =
  40. 40.407 + 17 =

Answer key

  1. 464
  2. 598
  3. 104
  4. 248
  5. 183
  6. 343
  7. 576
  8. 561
  9. 365
  10. 488
  11. 445
  12. 121
  13. 182
  14. 176
  15. 133
  16. 545
  17. 103
  18. 391
  19. 370
  20. 500
  21. 136
  22. 557
  23. 309
  24. 160
  25. 129
  26. 444
  27. 423
  28. 340
  29. 452
  30. 155
  31. 135
  32. 122
  33. 342
  34. 526
  35. 109
  36. 425
  37. 101
  38. 395
  39. 378
  40. 424

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